Non-return valve.



"No. 840,174. PATENTED JAN. 1, 1907.

J. R. TANNER.

NON-RETURN VALVE.

' APPLICATION FILED JUNE 13, 1905.

WITNESSES; BNVENTDR 'fi v rjH.Tmn6 0Q M g JULHIS R. NER, OF PIITtaBURG, PENNSYLVANIA.

uonsarusu VALVE.

Specification of Letters Patent. Application filed J uno 13, 1905 Serial No. 266.021.

Patented J an. 1, 1907.

To all whom, it 7771/61/(1/17b0fl77b.

? Be it 'knownthat I, JULIUS R. TANNER, a

citizen of the United States, residing at Pittsburg, in tliti county of Allegheny and State of Pennsylvania, have invented or (liSLUVOIEtl new and useful Improvements in headteturn Valve's, of which the following is a speciin the flow or pressure of My invention relates, to non-return valves which are a kind of check-valve which is constructed to be unatl'ected by sudden change the fluid-current passing through the valve. thus preventing the hammer ng of the valves on their seats.

ton .12, which .fits the said It is thergbjectof my invention to provide a valve of this desert uon which can be applied to any globe-Va 'e or other valve with accessible valve-seat withoutany modification in the 'alve'casing or seat.

My invention consists of an attachment which is preferably wholly supported by the valve-seat, which necessitates no change whatever in the valve-stem or the opening in which the bonnet. is attached.

The figure oi the drawing shows a longitudinal section through my improved valve, the dotted hues showing the valve open and the Full lines the valve closed Referrin now tov the drawing, 1 re resents the bridge or partition in whit-.1 is screwed the valve-seat proper, 2. Supported on the toiioi" the annular valve-seat 2 are several posts L3, having their upper ends joined by the, ring or band 4, which is threaded on its inner surface. Screwed into the threads of the band 4. ,is the dash- )ot cylinder 5, open at its upper and, which is seated a short distance cap ' Slidablc toward and from the valve-seat 2 is the valve proper, 7, which its tightly at its edges on the upper inner portion of the valveseat, so as to be movable upwardly from its" shown on the :low the bonnet or 6 Inent of the valve-stem.

reversed, the valve will The valvestem 13 extends through the cap 6 in alinement with the post 11. The cap is provided with the usual stuiling-box 1i and gland 15. The lower end of the valve-stem is provided with a head or flange 10, having its upper face beveled so as to fit a seat n the under side when the stern is withdrawn to such an extent thatthe head or flange 16 fits its seat no steam or other lluid can pass along the valves stein, thus permitting the stufling-box to be repacked even when the valve is wide open. The stem. is screw-threaded at its upper end and operatesin the nut lflsupported in any approved manner.

18 represents a hand-wheel by which the valve-stein may be rotated.

It wi ll be seen that when the valve is open and the valve-stem is being turned down it will force the valve onto its seat and hold it there until again released by a reverse move- When the valve-, stem is raised, the fluid-pressure, which enters the valve in the direction of the arrow 19, lifts the valve from its seat and maintains it lifted so lon as the flow rection. W en, however, the flow of fluid is be automatically closed by the returning lluid; but this return of the valve will be retarded by the action of the dash-pot, which was filled during remains in this di-' of the cap 6, so-that the opening of the valve, owing to the suction of the )iston within the cylinder 5. The re. turn of the valve will be made slow by reason of the time required for the fluid between the pistonand the bottom. of the cylinder 5 to esca e. The above-deseribed action-would be t at occurring when the reverse action of the fluid was sulliciently rolon ed to cause enough of the liquid in t e das pot to escape; but in the case of momentary or very short reversal of the fluid through 'the valve the dash-pot would not be appreciably moved because there would not be sufficient timefor the escape /of any appreciable quantity of fluid from :the dash-pot. sired to out off the [low oi fluid through the valve, the valve-stem is o erated in the manner described to force t 1e valve tightly upon its seat.

The advantages of my invention will become apparent when it is seen that there is no modification whatever of the usual valvecasing. All that is necessary to do to apply my invention is to remove the cap or bonnet from the valve and to unscrew the annular When it is desteam or other threads, and to screw in my'improvement.

valve-seat from .the bridge or to' internally thread the valve-seat, provided itjhas no My invention does not have to be made to fit any particular form of valve-seat 01 any particular size or shape of the opening which is closed by the cap or bonnet. It is a unitary compactattxwhment, which only has to be screwed into the position when it is ready for ilnn-iediate use.

I do' not desire to be restricted to the details shown and described, but claim. protec- & ti'on'for all mechanical equivalents.

Having described my invention, 1 claiin 1. 1n a n0n-return valve, an iinsertible valve-seat in combination with a daslvpot 1 :men ber supported by said valve-scat member, apistonvimthe dash-pot, and a valve between the dash-potandtheseat.

i 8th day of June,

2. In a non-return valve, a valve-seat member insertible in the same, adash-pot' member carried by said valve-seat member l thereby, a dash-pot piston therein, a valve secured -to said piston and adapted to said seat, the said cylinder and valve both being 1 on the same side of said valve-seat mniber.

Signed at Pitt-sburg, Pennsylvariih, this A. D. 1905. i

, -JULIUS R. TAN NER.

Witnesses:

ALICE E; DU'FF, F, N BARBER-J 

